so can i delivar a stripped down JVM that only includes the packages i really need?

This is legally impossible. Sun requires you to redistribute the (more or less) unmodified JRE only. See "Redistribution of the Java 2 Runtime Environment" section in the README.txt under the "jre"-directory for more details.

you could have a look into gcj, if you dig around on the lwjgl forum theres a post on how to get it to work with lwjgl, that way you can build a native version for the system you are targeting without the jre.

I think Cas uses Excelsior JET (http://www.excelsior-usa.com/jet.html). This is a AOT compiler that can reduces the size of your app and maybe the JVM too? Anyway, the main reason for using JET is for better speed execution and better start up time.

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